Goals from winger Giovani dos Santos and Pablo Counago gave Keane victory in his first game at Portman Road.
Clinton Morrison netted a late consolation for the visitors in the Championship clash.
But Keane, who has now won his first two games in charge, was not satisfied.
When asked his thoughts about Sunday's performance, he said: "Good, bad, a bit of everything."
He added: "I think today's performance probably summed up the team and the season. There was some good stuff and some bad stuff."
Keane said he had learned a lot in the 10 days since taking charge and admitted improvements needed to be made.
"After they scored we lost a little bit of composure and stopped doing the basics," said the former Sunderland boss.
"People were surprised when I came in 10 days ago saying I could learn a lot about my players in the next 10 days but I have."
He continued: "If you know anything about football, there's a big challenge ahead.
"This time next year we don't want to be walking on to the pitch, finishing eighth or ninth, applauding the fans."
Loanee Dos Santos, who scored his fourth goal in eight games since joining from Tottenham, will now return to the Premier League side, Keane said.
"I will be planning ahead without Gio," he said.
"I think it's fairly unrealistic that we can get him to the club. I think he will be playing at a higher level."
Counago's 11th goal of the season sealed victory for Ipswich - their third on the spin - and ensured a ninth-place finish.
Keane, who received a rapturous reception when walking to the home dug-out, said: "I sound like we've lost the game 4-0. Credit to the players, we won 2-1. We do look like we are capable of scoring goals."
Coventry boss Chris Coleman felt his side could have snatched an equaliser, with winger Robbie Simpson hitting the bar with a free-kick in virtually the last kick of the game.
"We knew it was going to be tough, obviously with Ipswich having a new manager with a big reputation," said Coleman.
"They are coming on the back of a 3-0 win at Cardiff and then we lose two goals in a short space of time.
"I thought we could have collapsed but we didn't."
He added: "I thought the lads did well. We came back. We should have scored more goals, really. They had one or two situations where they defended well."
Coleman admitted his side, who finished in 17th place, had limped over the line to the end of the season.
"The last six or eight weeks, the wheels have come off, really," he said.
"It's been miserable for us."
And he looked ahead for changes ahead of the next campaign.
"We're going to make changes in the summer," he said.